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- W2267999600 abstract "Agricultural production is highly dependent on climate variability in many parts of the world. In particular, drought may severely reduce crop yields, potentially affecting food availability at local, regional, and global scales. The Food and Agriculture Organization of the United Nations FAO operates the Global Early Warning System GIEWS, which monitors global food supply and demand. One of the key challenges is to obtain synoptic information on a recurrent and timely basis about drought-affected agricultural zones. This is needed to quickly identify areas requiring immediate attention. The Agricultural Stress Index System ASIS, based on imagery from the Advanced Very High Resolution Radiometer AVHRR sensors on board the National Oceanic and Atmospheric Administration NOAA and Meteorological Operational Satellite METOP satellites, was specifically developed to meet this need. The system is based on a methodology developed by Rojas, Vrieling, and Rembold over the African continent. This approach has been modified and adapted to the global scale to produce an agricultural stress index ASI representing, per administrative unit, the percentage of cropland or pasture areas affected by drought over the growing season. The vegetation health index VHI, based on normalized difference vegetation index NDVI and temperature anomalies, is used as a drought indicator. A fused time series of AVHRR data from METOP and NOAA was used to produce a consistent time series of VHI at 1 km resolution. Global phenology maps, indicating the number of growing seasons and their start and end dates, were derived from a multi-annual image set of SPOT-Vegetation 1999–2011. The VHI time series and phenology maps were then combined to produce the ASI for the years 1984 to the present. This allowed evaluation of the suitability of the ASIS to identify drought using historical reports and ancillary data. As a result of this analysis, ASIS was positively evaluated to support the FAO early warning system." @default.
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- W2267999600 date "2016-01-04" @default.
- W2267999600 modified "2023-09-28" @default.
- W2267999600 title "FAO’s AVHRR-based Agricultural Stress Index System (ASIS) for global drought monitoring" @default.
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- W2267999600 doi "https://doi.org/10.1080/01431161.2015.1126378" @default.
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